Product Manual

4-1
Chapter 4
Operation
Operation
1. Select the required weights and stack them on the appropriate piston assembly. The
pressure measured is the sum of the weights plus the piston/weight carrier.
Dual PCU models: The PCU’s are matched in a ratio of effective areas, 20:1 or 10:1,
depending upon model, and the weights will be marked accordingly with both high and
low pressure values.
Note
The priming pump is intended for system priming only, and cannot be used
to generate high pressures.
2. Turn the capstan in (clockwise) to generate pressure. When the piston rises, ensure
that the bottom face of the lowest weight is level with the groove, midway in the
recessed area on the indicator post.
Weight
(High Pressure)
Low Pressure
Float Range
Weight
(Low Pressure)
High Pressure
Float Range
gjn002-2.eps
Figure 4-1. Float-Height Indicator Post
Note
This is the PCU mid-float position, which is the point at which all internal corrections
have been made with reference to the pressure datum (at the top of the test port). The
recessed area is simply a guide for the operator to indicate the PCU travel limits.